Pulverizer.



No. 870,261. PATENTED NOVL, 1907. B. I. TURMAN.

PULVERIZER.

APBLIOATION FILED NOV. 6. 1906.

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Weltraum? UNITED STATES PATENT OFFICE.

BYRON I. TURMAN, OF OAKLAND, CALIFORNIA, ASSIGNOR TO NEW IDEA PULVERIZING MILL COMPANY, OF SAN FRANCISCO, CALIFORNIA, A CORPORATION OF ARIZONA TERRITORY.

PULVERIZER.

Specification of Letters Patent.

Patented Nov. 57 1907.

To all whom t may concern:

Be it known that I, BYRON I. TURMAN, a citizen of the United States, residing at Oakland, in the county of Alameda and State of California, have invented a new and useful Improvement in Pulverizers, of which the following is a specification.

With the Constantly increasing use of cement for building and other purposes comes the demand for simple, cheap and efficient means for producing it. When it is considered that in the production of cement the raw material must be taken in the form of solid rock of a comparatively large size and be reduced to the desired state of fineness or pulverization, as capable of being carried by a current of air, the importance of machinery that will accomplish this with the least possible expenditure of power and manual labor becomes apparent.

In the pulverizer which I have invented the material is first acted upon by a pinching or crushing pressure which may be varied to suit the size and condition of the material being acted upon, after which it is passed under one or more sets of traveling rolling Crushers, which, where there is more than one set, increases in pressure and, acting upon the material in a finer or more subdivided state, pulverizes the material to a greater degree. But as it is impossible to reduce all of the material to the desired condition of subdivision or fineness with once passing it through the mill, I have provided means for returning the lrejects or larger particles to the pulverizing mechanism for further treatment until the entire mass or amount of material fed to the mill is sufficiently reduced, as for instance, susceptible of being removed by an air current.

The accompanying drawings illustrate one form of mechanism embodying my invention.

Figure l, is a central vertical sectional view of the mill, and Figs. 2 and 3, are perspective detail views.

l indicates the base of-my improved mill on whichis mounted or formed an annular ball race 2. The race is filled with steel balls 3, which are made to travel around therein by means of an inverted race 4. Concentrically within the race is a vertical shaft 5, to which power may be applied in any suitable manner, as by the gearing 6 and pulleys 6 from any suitable source of power', not shown. Mounted loosely upon the shaft is a anged cone 7, which rest upon the inverted ball race 4, an annular strip 8, being inserted between them. Surrounding the cone, and resting upon the flange, is a cylindrical shell 9, into the open upper end of which the material to be crushed is fed. The upper end of the shell is supported concentric-ally or eccentrically relatively to the shaft by means of antifriction bearings l0, which are mounted in a movable frame ll, the frame being moved into any desired position, and held there, by awedge, or the screw threador cylinder may be formed in annular sections which can be held together by any suitable means.

The material can be fed into the shell from any suitable feeder, not shown, the feeder being operated by a cam wiper 14, on the shaft 5. As the cone and shell rotate with the shaft, the latter is provided with means for engaging with the cone, which is best done by making the shaft feathered or angular in cross sections, this will permit the cone to slide down the shaft as the balls and raceways become worn. Srurounding the lower portion of the cone, the balls and the raceways, is a casing l5, which receives the crushed material from between the inclined surfaces of the flangel of the cone and the bottom of the cylinder and discharges it into the ball race 2, under the balls 3, which pulverize and discharge it into the space 16. 17 indicates a raceway which forms the third pulverizing surface. Balls 18 are rolled around in the race by the inverted race 19, which supports a coneY 20 on the shaft 5. Around the lower balls and raceways is a metal casing 2l, which receives the crushed material and passes it under the balls 18. The base l or upper base is supported above the lower or supplemental base 22 by a section of the metal or wooden frame 23 and each base consists of a fiat plate of metal. The material to be pulver-ized is fed into the top of the cylinder and passed directly from the cylinder to the first, or upper set of balls and from there to the succeeding set, or sets, if there be more than one, and from the last set the material falls into the hopper 24 and all that is fine enough is taken out through the exhaust 25 and the balance is delivered to the conveyer 26. From the conveyer it is passed to the elevator 27 which discharges it into the spout 28 from which it falls into the cylinder and is again passed through or over the pulverizing surfaces.

The fan for the exhaust pipe and the conveyer may be driven from the motor shaft 29 by the belting 30 and 3l. The elevator may be driven from the shaft 5, of the mill, by the belting 32. The exhaust may be through the shaft 5, which can be made hollow for that purpose.

33 is the supporting frame which may be made of any suitable material, metal being preferred, which H may rest upon a base as shown. In the construction shown in the drawings, and which I prefer, the posts or uprights of the frame are formed from angle iron, those above the base l, as shown at 34 in Fig. 3, being provided with a laterally extending foot 35, which is preferably formed by splitting the iron at the angleand bending each side at right angles to the upright portion. The upper portion of each post 34 is provided with perforations 36, to which the other parts of the frame may be bolted or otherwise secured. The posts of the lower frame 23 are formed in the same manner except that the perforations are omitted and ed shaft l2, and hand wheel 13. If desiredthe shell flanges are formed in` the same manner as the feet 35,

which are secured to the plate l by the same bolts 37 that secure the posts 34 of the upper frame, 33 in position, The upper ends of the posts 34- support cross pieces 38 and 39, which carry the bracket 40 and screw l2, respectively, and they are also engaged by the inclined braces 4l and 42 for holding them in position.

The plate l is provided with perforations 43 at each corner through which the bolts 37 pass, and at the center it is provided with an opening 44 through which projects the upper end of the cone 20. A flange 45 upon each side of tlie plate l encircles the opening at a distance therefrom, to form a retainer on top for the ball race 2 and the shell l5, and upon the lower side it forms a retainer for the upper end of the shell 2l. l The lower end of the shell 2l rests upon a plate 46 similar to the plate l except that its flange 47 is only upon the upper side where it forms a retainer for the ball race 17.

By constructing the mill in this manner it can be made up from comparatively small piecesv so that it can be readily transported and yet can be rigidly held in position when it is assembled. The two shells form a chute which is open at the top and at the bot tom it communicates with the chamber below the cru'shers, through which the air can be drawn down into and through the pulverizing mechanism, thereby causing it to` take up and carry oilany portions of the material as soon it has been crushed to the desired degree of fineness. This will increase the capacity of the mill as it will always be acting upon coarse material and never upon material after it has been pulveriZed as vline as desired. By regulating the force of the draft the degree of pulverization can be controlled to suit the material being produced, as the stronger the current the larger will be the particles drawn off, and the weaker the current the finer they must be to be removed.

The conveyer 2G may be either a screw or belt. The balls, raceways and wearing parts may be made of granite, agate, onyx, silex, silica, porcelain, or any other mineral or metallic substance, as steel or iron,

As above described it will be seen that the eccen-A tricity of the shell can be adjusted as to produce the best results in the initial crushing, after which the material passes by gravity to the balls and from there to the separating chamber below the lower set of balls or rollers. By actuating the feeder with the wiper 14 the entire operation of pulverizing the Inaterial is automatic, thereby dispensing with all manual labor except what is necessary to supply the feeder with material and to take care of the nished product, l

. them together,

and by performing the initial crushing by locating the shell eccentrically to the cone and rotating both of them and then completing the operation by the rotary balls the minimum amount of power is required, and at the same time an extremely uniform and valuable product is secured.

Although l have described my invention as adapted for making cement it is evident that it can be used equally as well for pulverizing other material, either wet or dry, as quartz, etc. for the extraction of the values, and especially for the extraction of gold by the cyanid process in which it has been found very desirable to reduce the material to an extremely minute degree of iineness to permit of the rapid action of the solution. lt is also evident that changes and alterations maybe made in the mill and I reserve the right to all such variations from what l have shown as will come Within the scope of my invention7 as for instance, the mechanism for producing the air current may be changed to causing a blast or it may be omitted entirely, as when used for crushing quartz, etc. and other forms of returning the material may be used instead of the elevator shown.

l. In a pulverizer, an upper base and a lower base, each provided with a central perforation and flanged annularly, the flanges being near the openings, the lower base being flanged upon the top and the upper base being flanged upon both sides, a casing between said bases and surrounding their' respective flanges, a casing resting upon the upper base and surrounding the flange thereon, a raceway between the top flange of each base and the perforation, a set of rollers in each raceway, an inverted raceway on each set of rollers, a cone on each inverted raceway, a rotary shaft through the cones for rotating them, means for passing a current of air between the casings and the rollers, and means for returning the rejects to the rollers and the raceways.

2. In a pulverizer, an upper base and a lower base, each comprising a flat metallic plate, perforated at its center and adjacent to its edges and flanged annular-1y near to the central perforation, casings and Crushers on said bases at a distance apart and in engagement with said flanges, posts, the ends of which are flanged and perforated to register' with the edge perforations of the bases, bolts through said Iianges and said bases for securing braces and cross pieces connected with the upper posts, means for passing a current of air between the easings and the Crushers, and means for returning the rejects to the Crushers. i

In testimony whereof I have hereunto set myhand and affixed my seal this 31st day of October, 1906.

' BYRON I. TURMAN. [11. s.]

Witnesses:

FRANK Bnorirr, M. MACDONALD. 

